Hair straightener



FIG. 1 is a front of a hair straightener showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right, top perspective view thereof;

FIG. 8 is a right, bottom perspective view thereof;

FIG. 9 is an enlarged view of portion “9” shown in FIG. 1;

FIG. 10 is an enlarged view of portion “10” shown in FIG. 2;

FIG. 11 is an enlarged view of portion “11” shown in FIG. 3; and,

FIG. 12 is an enlarged view of portion “12” shown in FIG. 8.

In the drawings, the broken lines illustrate portions of the hair straightener which form no part of the claimed design. 

CLAIM The ornamental design for a hair straightener, as shown and described. 